[TEST] adjust skip for msearch yaml test

This test had the parameters in the wrong place, so they ended up being ignored. After fixing the test (and making sure that the runner catches these errors), the parameters were read yet a skip is needed as max_concurrent_shard_requests is only supported from 6.5.0 on.

Closes #34827

Author: javanna

rest-api-spec/src/main/resources/rest-api-spec/test/msearch/10_basic.yml

@@ -66,8 +66,8 @@ setup:
 "Least impact smoke test":
 # only passing these parameters to make sure they are consumed
   - skip:
-      version: " - 6.99.99"
-      reason: "AwaitsFix'ing, see https://github.com/elastic/elasticsearch/issues/34827"
+      version: " - 6.4.99"
+      reason: "max_concurrent_shard_requests was added in 6.5.0"
   - do:
       msearch:
         max_concurrent_shard_requests: 1